A Photographic Atlas of Flood Basalt Volcanism by Hetu Sheth

Author:Hetu Sheth
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Fig. 8.36The coastal dyke swarm in East Greenland at Hængefjeldet, just north of Kangerlussuaq. The dykes here cut tuffs and volcaniclastic sediments of the Hængefjeldet Formation (Nielsen et al. 1981). The cliff in the foreground is ca. 70–100 m high from left to right. The light colour of the dykes in the photo reflects their composition and their greenschist facies mineralogy. These dykes relate to the later alkaline (Alk-1, Alk-2) and the late transitional dykes (Trans-1, Nielsen 1978). It is to be remembered that in some regions of the coast-parallel dyke swarm, transitional to mildly alkaline and often evolved compositions (to trachyte) constitute 30–50% of all dyke material, and that the dyke swarm developed possibly over 20 million years. It is not a simple analogy to the dyke injection at a mid-oceanic ridge under constant extension such as Iceland, but includes swarms of dykes related to highly evolved volcanic centres along the continental margin. The mountain in the background and across the glacier is Tinden, about 1044 m in height

Photo: Troels F.D. Nielsen, Geological Survey of Denmark and Greenland (GEUS)

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.